A synovial cyst of the wrist refers to a fluid-filled sac, usually benign but bothersome, located in the wrist joint. This condition can originate from a tendon or joint.
Synovial fluid is essential for lubricating joints. However, excessive secretion can lead to the formation of a synovial cyst. In the wrist, a distinction is made between an articular or arthro-synovial cyst and a synovial cyst of the tendons. The causes are not always known, except in cases of hand trauma. Pain is not always present. Discover what a synovial cyst of the wrist is, its causes, symptoms, and treatments.
Synovial cyst of the wrist: what is it?
A synovial cyst of the wrist is a swelling filled with viscous fluid in the wrist, explains the French Institute for Hand and Upper Limb Surgery. It is more frequently observed in young adults (between 20 and 30 years old), in both women and men. This condition is benign in the vast majority of cases, and the size of the cyst in no way indicates its severity. A distinction is made between an arthro-synovial cyst, located on the wrist joint, and a synovial cyst of the tendons. These two types of cysts, located in different areas, require different treatments.
An articular cyst originates from the joint capsule, the layer of tissue surrounding the wrist joints that contains synovial fluid. This type of cyst is most often located on the back of the wrist, between the tendons of the index and thumb. Less frequently, it can be observed on the palmar side. A synovial cyst of the tendons or tendon sheaths, called a tenosynovial cyst, is less common than an arthrosynovial cyst. It is located in an area of tendon friction, generally on the extensor tendons of the fingers.
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